CN211233351U

CN211233351U - Water heater

Info

Publication number: CN211233351U
Application number: CN201922194995.0U
Authority: CN
Inventors: 张霞; 马曾文; 梁桂源; 白瑜
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2019-12-09
Filing date: 2019-12-09
Publication date: 2020-08-11
Anticipated expiration: 2029-12-09

Abstract

The utility model relates to a water heater field specifically provides a water heater, include: the inlet end of the first heat exchanger is communicated with a first water return pipe, and the outlet end of the first heat exchanger is communicated with a first water outlet pipe; the first medium inlet end of the first heat exchanger is communicated with the first water outlet pipe, the first medium outlet end of the first heat exchanger is communicated with the first water return pipe, and the second medium inlet end and the second medium outlet end of the first heat exchanger are communicated with the domestic water pipeline; the flow dividing controller is arranged on a communication pipeline of the second heat exchanger and the first heat exchanger and is suitable for adjusting water flow flowing through the first heat exchanger and/or the second heat exchanger; and the inlet end of the second water return pipe is communicated with the first water return pipe, the outlet end of the second water return pipe is communicated with the first water outlet pipe, a second regulating valve is arranged on the second water return pipe and used for controlling the flow of the second water return pipe, and the first water outlet pipe and the first water return pipe are communicated with a heating loop. The utility model discloses a water heater can realize that heating and life hot water use simultaneously, and heating stability and travelling comfort are better.

Description

Water heater

Technical Field

The utility model relates to a water heater field, concretely relates to water heater.

Background

The water heater is a common heat exchange device, taking a household gas wall-mounted boiler as an example, the existing household mostly adopts a wall-mounted boiler with dual purposes of domestic hot water and heating hot water, and although the wall-mounted boiler can realize the functions of providing heating hot water and domestic hot water, the wall-mounted boiler cannot provide heating hot water and domestic hot water at the same time. That is, when heating is started, water heated in the main heat exchanger enters the heating circulation system, and domestic hot water cannot be produced at this time. When the domestic hot water is started, in order to ensure the preferential supply of the domestic hot water, the water heated in the main heat exchanger enters the domestic hot water circulating system, so that the supply of the heating system is cut off. For families with more members in winter, the room temperature is greatly reduced frequently due to the fact that the hot water function is used more and the using time is long, and the comfort is greatly influenced.

In order to solve the above problems, a wall-mounted gas boiler is provided in the prior art, in which an electric three-way valve with an adjustable opening is disposed at a water outlet end of a main heat exchanger, and the opening of a heating pipeline and the opening of a hot water pipeline are adjusted to simultaneously supply a heating system and a hot water system. However, the wall-mounted boiler has defects, hot water coming out of the main heat exchanger is respectively supplied to the heating system and the hot water system, and therefore the water inlet temperature of the heating system is the same as that of the hot water system, but in actual use, the heat required by heating is different from that of domestic hot water, and the floor heating is taken as an example, and the temperature of the hot water required by a general heating pipeline is lower than that of the domestic hot water pipeline, so that the wall-mounted boiler cannot meet the heat requirements of different systems when being used at the same time in a dual-function mode, and meanwhile, because the wall-mounted boiler is required to preferentially ensure the domestic hot water supply when being used, the temperature of the domestic hot water is adjusted to cause the temperature change of the heating system, so that constant.

SUMMERY OF THE UTILITY MODEL

The temperature for solving current hanging stove life hot water system and heating system influences mutually, causes the heating pipeline temperature higher, influences the technical problem of heating travelling comfort, the utility model provides a water heater.

In a first aspect, the present invention provides a water heater, comprising:

the inlet end of the first heat exchanger is communicated with a first water return pipe, and the outlet end of the first heat exchanger is communicated with a first water outlet pipe;

the first medium inlet end of the first heat exchanger is communicated with the first water outlet pipe, the first medium outlet end of the first heat exchanger is communicated with the first water return pipe, and the second medium inlet end and the second medium outlet end of the first heat exchanger are communicated with a domestic water pipeline;

the flow dividing controller is arranged on a communication pipeline of the second heat exchanger and the first heat exchanger and is suitable for adjusting the flow passing through the first heat exchanger and/or the second heat exchanger;

and the inlet end of the second water return pipe is communicated with the first water return pipe, the outlet end of the second water return pipe is communicated with the first water outlet pipe, a second regulating valve is arranged on the second water return pipe and used for controlling the flow of the second water return pipe, and the first water outlet pipe and the first water return pipe are communicated with a heating loop.

In some embodiments, the diversion controller is a three-way regulating valve, and is disposed on the first water return pipe or the first water outlet pipe.

In some embodiments, one inlet end and one outlet end of the flow dividing controller are communicated with the first water return pipe, and the other inlet end is communicated with the first medium outlet end.

In some embodiments, the water heater further comprises:

the first circulating pump is arranged on a communicating pipeline between the outlet end of the flow dividing controller and the inlet end of the first heat exchanger; and

and the second circulating pump is arranged on the outlet end of the second water return pipe and a communicating pipeline of the heating loop.

In some embodiments, the water heater further comprises:

and the first temperature sensor is arranged on the outlet end of the second water return pipe and a communication pipeline of the heating loop.

In some embodiments, the water heater further comprises:

the second temperature sensor is arranged at the outlet end of the second medium; and

and the first flow sensor is arranged at the second medium inlet end.

In some embodiments, the first heat exchanger is a gas heater, which includes a gas valve and a burner, the gas valve is communicated with a gas supply system, and a fan is disposed above the first heat exchanger.

In some embodiments, the second heat exchanger is a plate heat exchanger.

In a second aspect, the present invention further provides a method for controlling a water heater according to any one of the embodiments of the first aspect, the method comprising:

acquiring the current water temperature between the outlet end of the second water return pipe and a communication pipeline of the heating loop;

judging whether the current water temperature is higher than the preset temperature or not,

if so, opening the second regulating valve until the current water temperature is less than or equal to the preset temperature.

In some embodiments, if yes, opening the second regulating valve until the current water temperature is less than or equal to the preset temperature includes:

and if the current water temperature is higher than the preset temperature, controlling the flow of the second water return pipe according to the difference value between the current water temperature and the preset temperature until the current water temperature is lower than or equal to the preset temperature.

The technical scheme of the utility model, following beneficial effect has:

1) the utility model provides a water heater, including first heat exchanger, second heat exchanger, shunt controller and second wet return, first heat exchanger is the main heat exchanger of water heater, and its entry end communicates first wet return, and the exit end communicates first outlet pipe to provide the heat for the system circulation water. The second heat exchanger is a domestic hot water heat exchanger, a first medium inlet end of the second heat exchanger is communicated with a first water outlet pipe, a first medium outlet end of the second heat exchanger is communicated with a first water return pipe so as to be connected with the main circulation system of the water heater in parallel, and an inlet end of a second medium and an outlet end of the second medium are communicated with a domestic water pipeline so as to realize heat exchange and water supply of domestic hot water through the second heat exchanger. The flow dividing controller is arranged on a communication pipeline of the second heat exchanger and the first heat exchanger, is suitable for adjusting the flow flowing through the first heat exchanger and/or the second heat exchanger, and realizes the simultaneous supply of domestic hot water and heating water by adjusting the water flow of the two pipelines. The inlet end of the second water return pipe is communicated with the first water return pipe, the outlet end of the second water return pipe is communicated with the first water outlet pipe, a second regulating valve is arranged on the second water return pipe and used for controlling the flow of the second water return pipe, the second water return pipe is communicated with the first water outlet pipe and the first water return pipe, when the temperature of the first water outlet pipe is higher, low-temperature water of the first water return pipe of the accessible compensates high-temperature water of the first water outlet pipe, therefore, the temperature of a heating loop is reduced, the temperature of a heating system is kept constant, and the heating comfort is.

2) The utility model provides a water heater control method, including the current temperature in the exit end that acquires the second wet return and the communicating pipe way in heating return, judge whether current temperature is greater than preset temperature, if, then explain that the temperature in the heating system fluctuates, lead to heating temperature higher, consequently open the second governing valve for low temperature water in the first wet return mixes the high temperature water of first outlet pipe, thereby reduces heating system's heat supply, keeps heating constancy of temperature, improves the heating travelling comfort. If current temperature is greater than preset temperature, according to current temperature and the flow of presetting the difference control second wet return of temperature, when the difference in temperature is great, it is undulant higher to prove the heating water temperature, needs rapid cooling, and consequently adjustment second wet return flow is great to drop the heating temperature to required temperature fast, keep the heating constancy of temperature, improve the heating travelling comfort.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic view of a hot water boiler according to some embodiments of the present invention.

Fig. 2 is a control schematic diagram of a hot water boiler according to some embodiments of the present invention.

Fig. 3 is a flowchart of a hot water boiler control method according to some embodiments of the present invention.

Description of reference numerals:

1-a first water return pipe; 2-a first water outlet pipe; 3-a first media inlet end; 4-a first medium outlet end; 5-a second water return pipe; 6-a second media inlet end; 7-second medium outlet end; 10-a first heat exchanger; 11-a fan; 12-a burner; 13-a gas valve; 20-a second heat exchanger; 30-a shunt controller; 40-a second regulating valve; 50-a first circulation pump; 60-a second circulation pump; 70-a first temperature sensor; 80-a second temperature sensor; 90-first flow sensor.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some examples of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work all belong to the protection scope of the present invention. Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

The utility model provides a water heater can be used to water heater indirect heating equipment, for example domestic hanging stove, heating stove etc. can realize heating and life hot water and supply simultaneously. It should be noted that, in the design of the wall-mounted boiler, the principle of priority of domestic hot water needs to be ensured, so that when the wall-mounted boiler in the prior art is used for heating and domestic hot water simultaneously, in order to ensure the optimal supply of domestic hot water, the temperature of the heating system fluctuates along with the adjustment of the temperature of the domestic hot water, and thus the heating supply temperature fluctuates greatly when the domestic hot water is used for a long time. Especially for floor heating, the heat exchange temperature of the floor heating system is often lower than that of domestic hot water in winter, and the dual-purpose stove in the prior art leads to higher water temperature in the floor heating system and influences heating comfort in order to ensure normal supply of the domestic hot water. Based on this, the utility model provides a hot water boiler and control method thereof is through compensating the adjustment to the heating temperature to keep heating system constancy of temperature, improve the heating travelling comfort.

In a first aspect, as shown in fig. 1, the utility model provides a water heater includes first heat exchanger 10, second heat exchanger 20, circulation pipeline and shunt controller 30 etc. and first heat exchanger 10 is the main heat exchanger of water heater, provides the heat for the circulating water of water heater. In the present embodiment, the first heat exchanger 10 is, for example, a gas heater, as shown in fig. 1, the gas heater includes a gas valve 13, a burner 12, and a fan 11, the gas valve 13 may be an existing gas proportional valve, an air inlet end of the gas valve 13 is communicated with a gas supply pipeline, an air outlet end is communicated with the burner 12, and the gas valve 13 can provide different combustion powers by controlling an air inlet ratio and a flow rate of natural gas and air. The combustor 12 adopts the burning fire row that a plurality of fire holes are constituteed, through the burning quantity that the control burning fire was arranged, also can realize controlling different combustion power, and the fire is arranged the top and is set up fan 11 to the flue gas that will burn the production is discharged.

The circulation pipeline comprises a first return pipe 1 and a first water outlet pipe 2, the inlet end of the first heat exchanger 10 is communicated with the first return pipe 1, the outlet end of the first heat exchanger is communicated with the first water outlet pipe 2, and the first water outlet pipe 2 and the first return pipe 1 are communicated with the heating loop, so that a heating circulation loop is formed, wherein water flows from the first return pipe 1 to the first water outlet pipe 2. When the low-temperature water in the first water return pipe 1 flows through the first heat exchanger 10, the first heat exchanger 10 heats the water in the pipeline, so that the heated high-temperature hot water flows into the first water outlet pipe 2 through the outlet end of the first heat exchanger 10 and then enters the heating loop for heat exchange.

As shown in fig. 1, in the present embodiment, the second heat exchanger 20 may be, for example, a plate heat exchanger, and the second heat exchanger 20 is connected in parallel with the first heat exchanger 10 in the heating cycle. The first medium inlet end 3 of the second heat exchanger 20 is communicated with the first water outlet pipe 2, and the first medium outlet end 4 is communicated with the first water return pipe 1, so that the high-temperature hot water heated by the first heat exchanger 10 flows back to the first water return pipe 1 after participating in heat exchange through the second heat exchanger 20, and participates in next circulation. The plate heat exchanger is used for exchanging heat for domestic hot water, so the second heat exchanger 20 further comprises a second medium loop, an inlet end 6 of a second medium and an outlet end 7 of the second medium are communicated with a pipeline of domestic water, low-temperature domestic water enters the plate heat exchanger through the second medium inlet end 6, high-temperature domestic hot water after heat exchange enters a domestic water pipeline through the second medium outlet end 7, and domestic hot water is provided for bathing, washing and the like of a user.

In order to ensure the simultaneous use of domestic hot water and a heating system, the water heater further comprises a bypass controller 30, wherein the bypass controller 30 is disposed on a communication pipeline between the second heat exchanger 20 and the first heat exchanger 10, and is adapted to adjust the flow rate of water flowing through the first heat exchanger 10 and/or the second heat exchanger 20. Different hot water flows are distributed to the heating system and the domestic hot water system through the shunt controller 30, so that the domestic hot water and the heating system can be used simultaneously. For example, as shown in fig. 1, the flow dividing controller 30 may be a three-way regulating valve, which may be a stepping electric three-way valve, and may realize precise control of different water flows of the two branches. In this embodiment, the shunt controller 30 is disposed on the pipeline of the first water return pipe 1, one inlet end and the outlet end of the shunt controller are communicated with the first water return pipe 1, and the other inlet end is communicated with the first medium outlet end 4, so that the flow control of the two shunts is realized by adjusting the opening degree of each inlet end of the shunt controller 30. For example, when the water heater only needs to provide heating function, the other inlet end of the controllable bypass controller 30 is closed, and the domestic hot water circulation is cut off, so that only heating water supply is provided; when the water heater only needs to provide domestic hot water, one inlet end of the controllable shunt controller 30 is closed, and the heating circulation is cut off, so that only domestic hot water is provided; when the water heater needs to provide two functions at the same time, the two inlet ends of the control shunt controller 30 are both in an open state, and the water supply heat of each shunt is controlled by further controlling the opening degree of each inlet end, generally, when the two functions are used at the same time, the heat supply of domestic hot water needs to be ensured at first.

In the present embodiment, to ensure the circulation of the supply water, a first circulation pump 50 is provided downstream of the outlet end of the flow dividing controller 30. For example, as shown in fig. 1, a first circulation pump 50 is disposed on a pipeline where the outlet end of the flow dividing controller 30 communicates with the first heat exchanger 10, and the first circulation pump 50 provides power to the circulation pipeline.

The utility model discloses a water heater is still including parallelly connected second wet return 5, as shown in FIG. 1, in this embodiment, the first wet return 1 of entry end intercommunication of second wet return 5, exit end intercommunication first outlet pipe 2 is equipped with second governing valve 40 on the second wet return 5, and second governing valve 40 is used for controlling the flow of second wet return 5. A second circulating pump 60 is arranged on a pipeline communicated with the heating loop at the outlet end of the second water return pipe 5, and the second circulating pump 60 is used for providing power for the low-temperature water in the first water return pipe 1 to flow into the first water outlet pipe 2 through the second water return pipe 5. Because the required temperature of heating system is less than the required temperature of life hot water, when guaranteeing life hot water supply, the temperature that flows into the heating return circuit through first outlet pipe 2 is higher, compensates the first outlet pipe 2 of high temperature with the low temperature return water through second wet return 5 this moment, cools down the hot water that gets into the heating return circuit, keeps the heating temperature invariable, improves the heating travelling comfort. The second regulating valve 40 is used for controlling the on-off and water flow of the second water return pipe 5, and can regulate different water flows according to different cooling requirements. In the embodiment shown in fig. 1, the second regulating valve 40 is a three-way valve, and in other alternative embodiments, the second regulating valve 40 may also be a two-way regulating valve disposed on the second water return pipe 5, which is not limited by the present invention.

In the present embodiment, as shown in fig. 1, the water heater further includes a first temperature sensor 70, and the first temperature sensor 70 is disposed on a communication line between the outlet end of the second water return pipe 5 and the heating circuit, so as to continuously detect the temperature of hot water entering the heating circuit and transmit a temperature signal to the main controller. For the domestic water loop, the second temperature sensor 80 is arranged at the second medium outlet end 7 of the second heat exchanger 20, the second temperature sensor 80 continuously detects the outlet water temperature of the domestic hot water, and sends a temperature signal to the main controller, so that the outlet water temperature of the domestic hot water of the user is ensured to be constant. A first flow sensor 90 is provided at the second medium inlet end 6 of the second heat exchanger 20 so as to continuously monitor the inflow rate of the domestic water.

The structure of the water heater of the present invention is described above, and on the basis of the above embodiments, the water heater of the present invention may have other alternative embodiments.

In alternative embodiments, the positions of the flow dividing controller 30 and the first circulation pump 50 are not limited to the above embodiments, but may be set at any other suitable positions. For example, the diversion controller 30 can be further disposed at the connection position of the first water outlet pipe 2 and the first medium inlet port 3, and the first circulating pump 50 can be further disposed on the communication pipe between the outlet end of the first heat exchanger 10 and the first medium inlet port 3, which is not limited by the present invention.

In other alternative embodiments, the flow dividing controller 30 is not limited to the three-way regulating valve described in the above embodiments, and may be implemented by two-way regulating valves, for example, one of the two-way regulating valves is provided on the heating circulation pipeline, and the other one of the two-way regulating valves is provided on the domestic hot water circulation pipeline.

In still other alternative embodiments, the first heat exchanger 10 and the second heat exchanger 20 may also adopt any other suitable equipment, for example, the first heat exchanger 10 may also adopt an electric heating device, and the second heat exchanger 20 may also adopt other forms of heat exchange equipment, which is not limited by the present invention.

In a second aspect, the present invention further provides a control method for a water heater, which can be applied to the water heater described in any of the above embodiments. In some embodiments, the utility model provides a hot water boiler control method includes:

and acquiring the current water temperature between the outlet end of the second water return pipe and the communication pipeline of the heating loop.

And judging whether the current water temperature is higher than the preset temperature, if so, opening the second regulating valve 40 until the current water temperature is lower than or equal to the preset temperature.

Particularly, through the temperature that continuously detects the hot water that gets into in the heating return circuit, judge whether current temperature is greater than and locate the temperature, if yes, then explain the heating system normal water temperature and take place undulantly, lead to the heating temperature higher, consequently open the second governing valve for low temperature water in the first return pipe mixes the high temperature water of first outlet pipe, thereby reduces heating system's heat supply, keeps heating temperature invariable, improves the heating travelling comfort.

In some embodiments, when the second water return pipe 5 is controlled by the second adjusting valve 40, it further includes: and if the current water temperature is higher than the set temperature, controlling the flow of the second water return pipe according to the difference value between the current water temperature and the preset temperature until the current water temperature is lower than or equal to the preset temperature. When the difference in temperature is great, it is higher to prove that heating water temperature is undulant, needs rapid cooling, and consequently adjustment second wet return flow is great to drop heating water temperature to required temperature fast, keep heating constancy of temperature, improve the heating travelling comfort.

The principle of the control method and the flow chart of some embodiments of the present invention are shown in fig. 2 and fig. 3, and the principle of the water heater and the control method thereof will be described with reference to fig. 2 and fig. 3.

As shown in fig. 2, the utility model discloses a water heater is including main control unit, and main control unit is connected with first temperature sensor 70, second temperature sensor 80, first flow sensor 90, first heat exchanger 10, second governing valve 40 and reposition of redundant personnel controller 30 electricity, and through accepting first temperature sensor 70, second temperature sensor 80 and first flow sensor 90's signal, and then control first heat exchanger 10, second governing valve 40 and reposition of redundant personnel controller 30.

As shown in fig. 3, in one embodiment, the control method of the present invention includes:

s10, the current water temperature detected by the first temperature sensor 70 is acquired. The first temperature sensor 70 continuously detects the temperature of the hot water entering the heating circuit.

S20, judging whether the current water temperature is higher than the preset temperature, if so, entering the step S30, and if not, entering the step S31. The preset temperature is a target temperature for keeping the indoor temperature comfortable, and may be a value or a range of values, for example, the preset temperature may be set to 40 degrees celsius.

And S30, determining the flow of the second water return pipe 5 according to the difference between the current water temperature and the preset temperature. If the current water temperature is higher than the preset temperature, it indicates that the water temperature in the heating system fluctuates, which results in a higher heating temperature, and the hot water in the first water outlet pipe 2 needs to be cooled. Calculating the difference value between the current water temperature and the preset temperature, and when the temperature difference is large, proving that the temperature fluctuation of the heating water is high, and the temperature needs to be quickly reduced, so that the flow of the second water return pipe is adjusted to be large, and the temperature of the heating water is quickly reduced to the required temperature; when the temperature difference is small, the heating water temperature fluctuation is small, and the flow of the second water return pipe 5 can be correspondingly reduced, so that different flows can be determined according to different temperature differences. In some embodiments, different flow values corresponding to different temperature difference ranges can be suggested in advance, and a pre-established correspondence table is stored in the main controller, and the main controller can obtain the flow values by looking up the table.

And S31, correspondingly adjusting the heating power of the first heat exchanger 10. If the current water temperature is lower than the preset temperature, the integral heating power of the water heater is proved to be too low, the dual functions cannot be simultaneously used, and the first heat exchanger 10 can be correspondingly controlled to increase the heating power according to the temperature difference.

And S40, controlling the opening degree of the second regulating valve 40 according to the flow of the second water return pipe 5, thereby providing corresponding water flow.

And S50, judging whether the current water temperature is not more than the preset temperature, and when the water temperature detected by the first temperature sensor 70 is not more than the preset temperature, proving that the water supply of the heating loop is recovered to the normal temperature without continuous cooling.

And S60, closing the second regulating valve 40 to complete the temperature regulation of the heating loop.

The above description is made on the structure and the control method of the water heater of the present invention, and those skilled in the art should understand that the hardware model and the connection method not mentioned in the above method can be realized by using the hardware and the corresponding connection method in the prior art, and those skilled in the art should be able to clearly and completely realize the technical solution of the present invention on the basis of the above disclosure.

It should be understood that the above embodiments are only examples for clearly illustrating the present invention, and are not intended to limit the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications can be made without departing from the scope of the invention.

Claims

1. A water heater, comprising:

the inlet end of the first heat exchanger (10) is communicated with the first water return pipe (1), and the outlet end of the first heat exchanger is communicated with the first water outlet pipe (2);

the first medium inlet end (3) of the second heat exchanger (20) is communicated with the first water outlet pipe (2), the first medium outlet end (4) of the second heat exchanger is communicated with the first water return pipe (1), and the second medium inlet end (6) and the second medium outlet end (7) of the second heat exchanger are communicated with a domestic water pipeline;

a flow diversion controller (30) arranged on a communication pipeline of the second heat exchanger (20) and the first heat exchanger (10) and used for adjusting water flow passing through the first heat exchanger (10) and/or the second heat exchanger (20);

second wet return (5), entry end intercommunication first wet return (1), exit end intercommunication first outlet pipe (2), be equipped with second governing valve (40) on second wet return (5), second governing valve (40) are used for control second wet return (5) flow, first outlet pipe (2) with first wet return (1) communicate in the heating return circuit.

2. The water heater of claim 1,

the shunt controller (30) is a three-way regulating valve and is arranged on the first water return pipe (1) or the first water outlet pipe (2).

3. The water heater according to claim 2,

one inlet end and one outlet end of the flow dividing controller (30) are communicated with the first water return pipe (1), and the other inlet end is communicated with the first medium outlet end (4).

4. The water heater of claim 3, further comprising:

the first circulating pump (50) is arranged on a communication pipeline between the outlet end of the flow dividing controller (30) and the inlet end of the first heat exchanger (10); and

and the second circulating pump (60) is arranged on a communicating pipeline between the outlet end of the second water return pipe (5) and the heating loop.

5. The water heater according to any one of claims 1 to 4, further comprising:

and the first temperature sensor (70) is arranged on a communication pipeline between the outlet end of the second water return pipe (5) and the heating loop.

6. The water heater according to any one of claims 1 to 4, further comprising:

a second temperature sensor (80) provided at the second medium outlet end (7); and

a first flow sensor (90) provided at the second media inlet end (6).

7. The water heater of claim 1,

first heat exchanger (10) are gas heater, and it includes gas valve (13) and combustor (12) of gas circuit intercommunication, gas valve (13) intercommunication air supply system, first heat exchanger (10) top is equipped with fan (11).

8. The water heater of claim 1,

the second heat exchanger (20) is a plate heat exchanger.